Did you ever use System.out.println() as one debug tool in J2EE?

I saw in HF page 260 that they used System.out.println() in the AttributeListener. I tried it but nothing happened. Didn't write anything in the console window. How about you? Did you ever use System.out.println() in the J2EE?

Here is the code. What do you think will happen in the console when this class is instantiated?